This curve is called the torque speed characteristic curve. Before going to the operation and characteristics of split phase induction motor we should first understand why single phase induction motor is not self starting.
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We can derive an equation from the equivalent circuit that allows the calculation of the torque for a given value of slip.
Ac induction motor characteristics. Current im and hence bnet are propor tional to e1. To make a single phase induction motor self starting we should somehow produce a rotating magnetic field. This may be achieved by converting a single phase supply into two phase supply through the use of an additional winding.
However the slip at which the maximum torque occurs changes with rotor resistance. These are of two types squirrel cage and slip ring motors. The torque slip curve for an induction motor gives us the information about the variation of torque with the slip.
Induction motor torque speed characteristics figure 612a illustrates a squirrel cage rotor of an induction motor that is operating at no load near synchronous speed. Speed torque characteristics of induction motor from eq. The important performance characteristics in the steady state are the efficiency power factor current starting torque maximum or pull out torque.
An induction motor or asynchronous motor is an ac electric motor in which the electric current in the rotor needed to produce torque is obtained by electromagnetic induction from the magnetic field of the stator winding. For this machine however because the stator must be connected to the three phase circuit the difference between being a motor or functioning as a generator lies in the speed of the rotor. Figure 1 showed a plot of induction motor torque vs speed from zero to synchronous speed.
When a motor is designed in such a way that impedance of the aluminum conductor of the rotor is reduced its efficiency is increased in a high speed range. 67 creates the net magnetic field bnet. Three phase ac induction motors are widely used in industrial and commercial applications.
240 shows the characteristics of induction motors. Speed torque characteristics of induction motor. These motors are self starting and use no capacitor start winding centrifugal switch or other starting device.
Since e1 remains constant. The slip is defined as the ratio of difference of synchronous speed and actual rotor speed to the synchronous speed of the machine. Torque slip characteristics of three phase induction motor.
127 it can be observed that the maximum torque is independent of rotor resistance. Similar to other types of electric machines a three phase induction machine can work as a generator and as a motor. The magnetization current im flowing in the motors equivalent circuit fig.
An induction motor can therefore be made without electrical connections to the rotor. Performance characteristics of three phase induction motor the equivalent circuits derived in the preceding section can be used to predict the performance characteristics of the induction machine.
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